Association of ethylene-vinyl acetate copolymer in dilute solutions - III. Critical association concentration

Association behavior of ethylene vinyl acetate (EVA) copolymer in four solvents 1, 2-dichloroethane (DCE), cyclohexane (CYH), xylene (XYL) and chloroform (CF) has been investigated by dilute solution viscometry. The critical association concentration (C-A) was determined at which the incipient decrease in slope of the eta(sp)/C similar to C curve in solutions at the dilute regime. Our results showed that whether the C-A could exist depends on solvent property. The values of C-A in DCE increase with increasing, of temperature and vinyl acetate (VA) content in EVA and decreasing of molecular weight of EVA.